Method
1. Preheat the oven to 180C. Line cupcake pans with paper liner.
2. Cream the butter and sugar with a mixer on high speed until light and fluffy.
3. Add eggs and eggs yolks, one at a time. Mix well each time, at medium speed.
4. In another mixing bowl, sift the matcha tea powder, salt, bicarbonate of soda and flour. Mix well with a spoon.
5. Add the sifted ingredients to the batter. Beat at medium speed till even.
6. Add buttermilk, vanilla and vinegar. Beat for another min at high speed.
7. Scoop 1 tsp of the batter into paper liners. Put in a small piece of adzuki bean paste.
8. Add more batter to cover the bean paste, up to 2/3 full.

Method1. Beat butter and cream cheese with a mixer on high speed till light and fluffy.
2. Add the icing sugar and mix well at medium speed.
3. Add the vanilla extract and adzuki bean paste. Mix well.
4. Pipe the icing on top of the cooled cupcakes.